Stroboscopic effect visibility measure toolbox

Function and application scripts associated with the stroboscopic effect visibility meter

This function implements the stroboscopic effect visibility (SVM) meter specified in CIE TN 006:2016 [1][3]. The SVM-meter can be used to objectively asses the visibility of stroboscopic effect due to light modulations of lighting products such as lamps, luminaires or drivers.
Possible causes of light modulations that may give rise to unacceptable visibility of stroboscopic effect are:
– AC supply combined with light source technology and its power source (driver) topology;
– Dimming technology of externally applied dimmers or internal light level regulators.
Modulation depth (MD) – also called percent flicker - and flicker index (FI) are often used to quantify flicker or stroboscopic effect. It has been shown, that both these metrics are not able to objectively score the level of stroboscopic effect as actually perceived by humans [2]. Therefore, instead of MD and FI, for the objective assessment of stroboscopic effect, the Stroboscopic effect Visibility Measure (SVM) is available [1].
SCRIPTS INCLUDED:
- SVM_applicationWaveform.m : generates light waveforms, calculates spectrum and SVM
- PlotVisibilityThreshold.m : plots the SVM visibility threshold curve
FUNCTIONS:
- getSensitivityStrobo : gives the SVM visibility threshold according to CIE TN 006:2016
- stroboVisibilityMeasure : calculates SVM according to CIE TN 006:2016
- pulseWaveformParameters : calculates the max and min value of a pulse-modulated waveform, for a given modulation depth, duty cycle and average level
REFERENCES:
[1] CIE TN 006:2016, Visual Aspects of Time-Modulated Lighting Systems – Definitions and Measurement Models, 2016-08-31: http://files.cie.co.at/883_CIE_TN_006-2016.pdf.
[2] D. Sekulovski, Is it all flicker?, https://www.youtube.com/watch?v=1gZg6eUmEGA, Webinar dd. 2016-03-24
[3] IEC Technical Report IEC TR 63158:2018-03 (ed.1.0), Equipment for general lighting purposes – Objective test method for stroboscopic effects of lighting equipment